Tonight, my phone app shows a "Refund in progress" message in my Inbox. I assume other have already (or will soon) received this same message.
"We discovered an inaccurate transaction in your Supercharging payment history. We have already refunded $xx.xx back to your credit card. We expect this refund to take up to 10 business days to reflect in your credit card statement. Thank you for being a Tesla owner and supporting our mission to accelerate the world's transition to sustainable energy."
Just got the same message in the Inbox in my Tesla app as well: